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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.classfile.editor;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.constant.Utf8Constant;
import proguard.classfile.util.*;
import proguard.classfile.visitor.ClassVisitor;
import java.util.Arrays;
/**
* This ClassVisitor removes specified interfaces from the classes and class
* signatures that it visits.
*
* @author Eric Lafortune
*/
public class InterfaceDeleter
extends SimplifiedVisitor
implements ClassVisitor,
AttributeVisitor
{
private static final boolean DEBUG = false;
private final boolean[] delete;
/**
* Creates a new InterfaceDeleter to remove the specified interfaces.
* @param delete an array that corresponds to the interfaces of a class
* and that specifies the ones to be removed.
*/
public InterfaceDeleter(boolean[] delete)
{
this.delete = delete;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
int[] interfaces = programClass.u2interfaces;
int interfacesCount = programClass.u2interfacesCount;
if (DEBUG)
{
System.out.println("InterfaceDeleter: "+programClass.getName()+" ("+interfacesCount+" interfaces)");
}
// Copy the interfaces that aren't deleted.
int newInterfacesCount = 0;
for (int index = 0; index < interfacesCount; index++)
{
if (DEBUG)
{
System.out.println("InterfaceDeleter: "+(delete[index]?"- ":"+ ")+programClass.getInterfaceName(index));
}
if (!delete[index])
{
interfaces[newInterfacesCount++] = interfaces[index];
}
}
// Update the signature.
if (newInterfacesCount < interfacesCount)
{
programClass.u2interfacesCount = newInterfacesCount;
programClass.attributesAccept(this);
}
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitSignatureAttribute(Clazz clazz, SignatureAttribute signatureAttribute)
{
Clazz[] referencedClasses = signatureAttribute.referencedClasses;
if (referencedClasses != null)
{
// Process the generic definitions, superclass, and implemented
// interfaces.
InternalTypeEnumeration internalTypeEnumeration =
new InternalTypeEnumeration(signatureAttribute.getSignature(clazz));
// Recompose the signature types in a string buffer.
StringBuffer newSignatureBuffer = new StringBuffer();
// Also update the array with referenced classes.
int referencedClassIndex = 0;
int newReferencedClassIndex = 0;
// Copy the variable type declarations and the super class type.
while (internalTypeEnumeration.hasMoreTypes())
{
String internalType = internalTypeEnumeration.nextType();
// Append the type.
newSignatureBuffer.append(internalType);
// Copy any referenced classes.
int classCount =
new DescriptorClassEnumeration(internalType).classCount();
for (int counter = 0; counter < classCount; counter++)
{
referencedClasses[newReferencedClassIndex++] =
referencedClasses[referencedClassIndex++];
}
if (DEBUG)
{
System.out.println("InterfaceDeleter: type = " + internalType + " (" + classCount + " referenced classes)");
}
if (ClassUtil.isInternalClassType(internalType))
{
break;
}
}
// Copy the interface types.
int index = 0;
while (internalTypeEnumeration.hasMoreTypes())
{
String internalType = internalTypeEnumeration.nextType();
int classCount =
new DescriptorClassEnumeration(internalType).classCount();
if (DEBUG)
{
System.out.println("InterfaceDeleter: type " + (delete[index] ? "- " : "+ ") + internalType + " (" + classCount + " referenced classes)");
}
if (!delete[index++])
{
// Append the type.
newSignatureBuffer.append(internalType);
// Copy any referenced classes.
for (int counter = 0; counter < classCount; counter++)
{
referencedClasses[newReferencedClassIndex++] =
referencedClasses[referencedClassIndex++];
}
}
else
{
referencedClassIndex += classCount;
}
}
// Update the signature.
((Utf8Constant)((ProgramClass)clazz).constantPool[signatureAttribute.u2signatureIndex]).setString(newSignatureBuffer.toString());
// Clear the remaining referenced classes.
Arrays.fill(referencedClasses,
newReferencedClassIndex,
referencedClassIndex,
null);
}
}
}
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